Split-Image Screen Prisms for Fundus Camera Staring Point Transmission
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Solution Overview
Problem
Conventional auxiliary staring and imaging focusing devices face issues where the central staring point cannot pass through the light-transmitting slit between two prisms, leading to incomplete illumination and focusing problems.
Innovation Solution
The device integrates a split-image screen with two facing prisms, forming a light-transmitting space between them to allow the central staring point to pass through, and includes an independently controllable staring point for focused illumination, simplifying the optical-path structure and enhancing focusing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-transmitting slit is provided between two prisms on the shutter, then the structure can block illumination light effectively, but the central staring point cannot pass through the slit
Solution Approach 1:
The shutter is segmented into multiple functional regions: a light-transmitting slit for blocking illumination light, two prisms for light deviation, and a light-transmitting space between the prisms for central staring point transmission. This segmentation allows each region to perform its specific function independently, resolving the contradiction between light blocking and staring point transmission.
Solution Approach 2:
Different regions of the shutter have different optical properties: the light-transmitting slit region blocks illumination light, the prism regions deviate light paths, and the central light-transmitting space allows staring point transmission. This local differentiation of optical properties enables simultaneous achievement of light blocking and staring point transmission.
2Measurement precision
If the light-transmitting slit is made narrow to improve focusing precision, then the illumination light path is better controlled, but the central staring point cannot pass through
Solution Approach 1:
The shutter is divided into a narrow light-transmitting slit for precise illumination control and a separate light-transmitting space between the prisms for central staring point transmission. This segmentation allows the slit to be narrow for focusing precision while the space between prisms remains open for staring point passage.
Solution Approach 2:
The two prisms act as intermediaries that create a light-transmitting space between them, allowing the central staring point to pass through while the narrow slit maintains focusing precision. The prisms mediate between the conflicting requirements of narrow slit and open passage.
3Object-affected harmful factors
If the shutter size is increased to improve illumination blocking, then more light is blocked, but the optical path becomes more complex
Solution Approach 1:
Multiple functions are merged into a single shutter component: illumination light blocking via the light-transmitting slit, light deviation via the two prisms, and central staring point transmission via the light-transmitting space between prisms. This merging reduces the need for separate components, simplifying the overall optical path structure while achieving effective light blocking.
Solution Approach 2:
The shutter is designed as a multi-functional component that simultaneously performs illumination blocking, light deviation, and staring point transmission. This universality reduces the number of separate components needed, thereby reducing device complexity while maintaining effective light blocking capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively addresses the issue of the central staring point not passing through the slit, simplifying the fundus camera's optical-path design, allowing for improved focusing and illumination by directly integrating the staring and focusing device into the lighting and imaging system.
Implementation Method 1
two facing prisms are disposed on the shutter and a light-transmitting space is formed between the two prisms for a center staring point to pass through
Implementation Method 2
The split-image screen and the staring point 10 form an opaque area blocking the illumination light path, and a light-transmitting area is formed by the blocks outside the opaque area
Data Source
AI summary
An auxiliary staring and imaging focusing device includes an illumination system, an imaging system, a staring device and a focusing device. The illumination system has an illumination optical-path to project a detection light to illuminate a fundus of a subject's eye. The imaging system has an imaging optical-path for receiving a reflected light and a fundus image of subject and imaging the reflected light and fundus image on an image display. The staring device is located in the illumination optical-path and forms a staring surface provided with staring points contrast with a detection light for the subject to watch. The focusing device is provided with a split-image screen in the illumination optical-path. The split-image screen has a shutter with a default size, and two facing prisms are disposed on the shutter and a light-transmitting space is formed between two prisms for a center staring point to pass through.